Answer this question truthfully
### Question: What causes Cholecystitis?
### Response: Chronic cholecystitis is usually caused by gallstones in the gallbladder. It is usually preceded by repeated attacks of acute cholecystitis. This leads to thickening of the gallbladder walls. The gallbladder begins to shrink and eventually loses the ability to perform its function, which is concentrating, storing, and releasing bile.